Stealth is absolutely correct
RE: "The most important knowledge is the complete mastery of basic strategy for the game(s) you are playing."
Do not gloss over this. IF your Basic Strategy is "off", because you are utilizing a generalized "universal" Basic Strategy; you'll not only misplay some hands; but if you are counting cards, you'll violate Basic Strategy (via your Index Numbers) incorrectly as well.
This is more expensive than you think it is !
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